Insects as power sources:
Of course, this might be less useful in Michigan winters... If it could somehow store up summertime energy collection for the rest of the year. Now THAT would be an idea!
Left-over beverages as power sources (via Inhabitat):
The $500,000 plan is being spearheaded by New Brunswick Community College’s Bio-energy and Bio-products Applied Research and Technology facility in Grand Falls, New Brunswick, Maine. The research team will use Milco Industries’ waste soda and beer for the trial. Traditionally the unwanted liquid is deposited in landfills, which can cost the company between $100,000 and $200,000 in disposal costs. However, with the plant’s new ethanol system, this beer and soda will be converted into 250,000 to 500,000 gallons of ethanol yearly. If the pilot project is a success, it is believed that Milco Industries will acquire an even larger-scale ethanol plant for their own internal use.
Well, I don't know: I tend to finish my beers and sodas... In a world powered by wasted beer and soda, would this make me a bad person?